IQMol - IQmol is a free open-source molecular editor and visualization package. It offers a range of features including a molecular editor, surface generation (orbitals and densities) and animations (vibrational modes and reaction pathways).
Chemissian - Chemissian is an analyzing tool of molecules electronic structure and spectra. It can manipulate molecular orbital energy-level diagrams (Hartree-Fock and Kohn-Sham orbitals), calculated and experimental UV-VIS electronic spectra, Natural transition orbitals, electronic/spin density maps and prepare them for publication.